Reading sequential pcap payload in Go

gistfile1.go

func pcapReader(filename string) (io.ReadCloser, error) {
	pr, pw, err := os.Pipe()
	if err != nil {
		return nil, err
	}
	handle, err := pcap.OpenOffline(filename)
	if err != nil {
		return nil, err
	}

	go func(h *pcap.Handle, w io.WriteCloser) {
		packetSource := gopacket.NewPacketSource(h, h.LinkType())
		for packet := range packetSource.Packets() {
			app := packet.ApplicationLayer()
			if app == nil {
				panic("Packet capture has no payload")
			}
			if _, err = w.Write(app.Payload()); err != nil {
				break // Silently ignore broken pipes.
			}
		}
		w.Close()
		h.Close()
	}(handle, pw)

	return pr, nil
}